Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
The solid state printable perovskite solar cell have been large interest these days for not only its ease of fabrication with low-cost materials, but also its high efficiency > ~20%. Many of issues still remained to achieve the sufficient device reproducibility and reliability in the long-time use in addition to the higher efficiency for the commercialization. Beyond these practical issues, the scientific understandings of the electron transfer with working principles including hysteresis of photocurrent-voltage characteristics are necessary to precisely control the device constructions. To extend the further understanding one of the critical device element, the interface effects, we herein report the effects of the crystalline facets of titanium dioxide meso-scaffold on the properties of deposited CH3NH3PbI3 Clx perovskite crystal and electron transport properties in the device configuration.The perovskite layer was deposited by the spin coating on the atomically flat rutile titania single crystalline substrates with exposing different facet, (100), (110), and (001). The deposited films was characterized by XRD and XPS revealing no significant difference, while the TiO2 substrate removed by DMF under sonication for 3h exhibited significant difference in the concentration of Cl, the contaminant from the precursor PbCl2. Although most of Cl contaminant was removed out of perovskite films during annealing process, the trace amount of Cl was still remained mainly at the interface of perovskite/TiO2 as indicated in the previous report. Furthermore the Cl amount depends on the density of titanium atoms exposed on each facet.The device characteristics were also affected by the dominant facet of titania scaffold in the meso-construction of perovskite solar cells. The electron transport properties of device were investigated by EIS revealing the difference in the electron transport resistance in the injection and recombination process at the interfaces.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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